18916897658 has 8 divisors (see below), whose sum is σ = 28556081652. Its totient is φ = 9398203776.

The previous prime is 18916897651. The next prime is 18916897661. The reversal of 18916897658 is 85679861981.

It can be written as a sum of positive squares in 2 ways, for example, as 16139923849 + 2776973809 = 127043^2 + 52697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18916897651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30122135 + ... + 30122762.

Almost surely, 2^18916897658 is an apocalyptic number.

18916897658 is a deficient number, since it is larger than the sum of its proper divisors (9639183994).

18916897658 is a wasteful number, since it uses less digits than its factorization.

18916897658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60245056.

The product of its digits is 52254720, while the sum is 68.

The spelling of 18916897658 in words is "eighteen billion, nine hundred sixteen million, eight hundred ninety-seven thousand, six hundred fifty-eight".